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4. Two hours into the same marathon the distance traveled by Harold and Erling are \( x \) and \( y \) kilometers, respectively. Write an expression to determine the distance between Harold and Erling? Hint: We do not know which quantity is greater. 5. Graph the following on the same \( x y \)-plane. \[ \begin{array}{l} y=\sqrt{x} \\ y=\frac{1}{2} x+\frac{1}{2} \end{array} \] What observations can you conclude about the line and curve near the point \( (1,1) \) ? Comment on the closeness between the two curves.

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